Farm Power · Farm Power · 1 mark · Multiple choice
Fuel property P predominantly governs hard/cold starting in a spark-ignition engine;property Q predominantly governs ignition delay in a compression-ignition engine. Identify P, Q.
Cold starting in an SI engine requires sufficient fuel vapor for a combustible mixture, so volatility is the relevant property. CI ignition delay measures readiness for autoignition;higher cetane number generally shortens that delay. Thus **P=volatility, Q=cetane number; B**.
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